Bootstrap Jumbotron Background Image Not Responsive

I'm fairly new to bootstrap and having a hard time trying to get my jumbotron background image to scale properly without showing the white background. I'm using Bootstrap Fixed Nav at the top of the page, Jumbotron (bg image) in the middle, and Sticky Footer. When I test in google chrome to see if the layout is correct, it seems that the image doesn't stretch down to the top of the footer, which shows the white background. How can I get the background image to scale properly for all devices?